Steel retainer



Dec. 2; 1 24- 1,517,478

R. H. WILHELM I STEEL RETAINER Filed Dec. 28, 1923 INVENTOR Rwse/ZEWZIZ elm I HIS ATTORNEY Patented Dec. 2, 124.

UNITED STATES nussnLL n. wnnnnn, ori nnsromrnnnsnvnnm, assrenon r meEnsonn-nann courmmr Jnnsnrcrrr, new JERSEY, n conronnrron or new s'rnnn nn'rarnnn.

To all whom it may concern:

Be it known that I, RUSSELL H. WIL- nnm, a, citizenof theUnited States, and. resident 'of.-Easton', county of Northamp-v ton, State of Pennsylvania, have invented a'certain Steel Retainer, of which thelfole lowing is a specification accompanied'by drawin'gs." This invention relates to drill steel retainore for rock drills, but more particularlyjto,

. that type of retainer in which'a yoke embraces the drill steel and is suitably held an I clamped in position upon the front head of themachine', n a

QRetainerS for the collaredWorkingimple v ment offluid actuated machines must be.

sturdyand rugged to withstand the vibration set up in the operation of the mach ne and the rou h usage'to' which they are sub- I jected. e event of breakage, they mustbe so constructed that broken parts may be;

readily replaced in order that the time re uired for repairs be reduced to a minimum.

t' is also'desirable'to hold the retainer in operative position to prevent the vibration of the machine from moving the retainer.

away from the working implement, as well as to enable the retainer to be heldin inoperative position when it is desired to re move the working implement froin'themafAnother object of the invention is to dime afretainer for a collared working im- 40 lenient-pf afluid actuated percussive machine which is simple in its construction, is composed of but few parts, f is cheap .to manufacture and is capable of withstanding the hardest kind 'of usage. I

Further objects of he invention will here-- inafter appear and the invention is shown in one of its preferred embodiments in :the

, accompanying drawings in which- 4 Figural is an elevation partly in verti- 59 cal section of the front end portion of a rock drill of the hammer type, 1

Figure 2-is a. similar view with the ma- I chine turned at rightangles to Figure 1, &n I

operative position of the retainer.

One object of this invention isenable tions H of the trunnions G.-

- y Application flfled'December 28, 1923. Serial No. 683,142

Figure 3 is a view similar to Figure 2 with the retainer swung to an inoperative position. p

Referringto hammer type, is shown for illustrative pur poses havlng a cylinder A which isvseparated; from the front head B by the front cylinder bushing C, and these parts are connected together by the usual spring pressed side bolts 1). In this instance a workingime plement in; the form ofa drill steel E having a collar F, is adaptedto extend into the front head B for receiving the impact blows ofthe fluid actuated hammer piston of the machine. v 1

A pair of. trunnions G is preferably formed on the front head B on opposite sides. thereof and is in this instance located in a plane ofl'setfrom the central, plane of themachine. Each trunnion is formed with a flattened portion H, which faces toward the outer endgof' the machine. A pair of side arms J is in this instance pivotally connected to the-trunnions G' and ,each arm is preferablyformed with an o ening K. A lug L on each side or the ront head 3 serves as-a stop for limiting the swinging F IcE. P

drawings thei front end portion'of ahand'heldrock drill of the:

movement of thelside arms J beyond the In order to limit; he outwardmovemen of :the collar Fen the steel E relative to the front headB, a yoke :O is adapted to embrace the steel in such; a manner that under normal working conditions-the steel is permitted 'tom'ove freely} within the yoke but 'cannot'be entirely withdrawn from the front head-B, because of the collar F. The

yoke O is infithis instance formedlwith a 4 .raised portionP; against "which the collar F is adapted; to-abut and'a air'of arms Q is preferably connectedto t e oke O. on I opposite sides thereofandexten substanand the ends of the yokearms Q, are

tially atright angles therefrom. \The yoke. 7 arms Q arein this instance adaptedto v exftend into the o ning K of the side arms J,

adapted to bear against the flattened pm- 'Inorder'to cushion the outward move ment of the yoke O, a coil spring S in this instance surrounds each of the yoke; arms a Q .ineach of the openings K. .One end of each coil spring is adapted to against one end of the opening K and the other end preferably bears against a nut T which is;

screwed onto one end of the yoke arms Q. The nuts T are in'this instance provided with holes U to enable a suitable toolto be inserted therein for screwing or unscrewing this manner the yoke .O is securely held in swung away from the steel the nuts for adjusting the tension of the The springs S are preferably springs S formed with projections V oneach end thereof, which are adapted to cooperate with recesses W in the side arms J and the nuts T to lock the nuts T in the desired position of adjustment.

In the position of the retainer shown in Figures 1 and 2, the yoke O is held in operative retaining position about the drill steel E to prevent withdrawal of the steel E. v The end portions R of the yoke arms Q, are-held against the flattened portions Hof the trunnions G by meansof the springs S andin retaining position, so that the ordinary jars and shocks set up in the operation of the machine will not move the yoke fromthis position.

As shown in Figure 3, the }yoke 0 may be steel to be withdrawn from the front head B and the springs S 'will'force the ends R of the yoke arms Q, against the trunnions G in order to hold the retainer in its inoperative position.

I claim: I 1. A retainer for fluid actuated percussive machines comprising the combination with the front end portion of a machine of a collared working implement adapted to extend into said front end portion, trunnions on opposite sides of said front end portion having a flattened portion, said trunnions being in a plane offset from the central plane ofthe machine, side arms pivotally connected to said trunnions, a yoke adapted to embrace said implement,- arms connected to said yoke at opposite sides thereof and extending at substantially right. angles therefrom, and spring means'for cushioning the outward movement of said yoke adapted to force one end ofsaid yoke arms against the flattened portions on said trunnions to hold said yoke in operative retaining position.

2. Ar retainer for fluid actuated percussive machines comprising the combination with the front end portion of a machine, of

a collared workin implement adapted to extend into said ront end portion, trunnions on opposite sides of said front end portion having a flattened portion, said trunnions being in a plane ofi'set from the central plane of the machine, side arms to enable the 3. A retainer for fluid actuated percussive machines comprising the combination with thefront end portion of a machine; of acollared workin implement adapted to extend into said ront end portion, trunnions on opposite sides of said front end portion having .a flattened portion, said trunnionsbeing in a plane offset from the central plane of the machine, side arms pivotall connected to said trunnions, a

yoke a apted-to embrace said implement,-

arms connected to said yoke at opposite ends thereof and extending at substantially right angles therefrom into saidside arms, a coil spring on each of said arms for cushioning the outward movement of said yoke and adapted to force one end of said yoke arms against the flattened portions on said trunnionsto holdv said yoke in retaining position, and means on;said yokefo manually adjusting the tension of said springs.

4.. Ag retainer for fluid actuated percussive machines comprising the combination with the front end portion of a machine, of a collared working implement adapted to extend into said front end portion, trunnions on opposite sides. of said front end portion, said trunnions being in a plane offset from the central plane of the machine, side arms ivotallyv connected to said trunnionsand 'ormed with an opening, a yoke adapted to embrace saidv implement for limiting the outward movement of the collar on said implement,arms connected to said yoke at opposite sides thereof and extendin at substantially right angles therefrom into said opening, a. nut screwed onto each of said yoke arms,-and a spring on each of said yoke arms adapted to cushion the outward movement of said yoke and to force one, end of said yoke arms against the flattened portion on said trunnions to hold said yokerin operative retaining position, saidyoke being adapted, to be swung away from said implement and held in inoperative position. n testimony whereof I have signed this specification. V a

RUSSELL H. WILHELM. 

